One-step homogeneous non-stripping chemiluminescence metal immunoassay based on catalytic activity of gold nanoparticles

The current climate crisis warrants investigation into alternative fuel sources. The hydrolysis reaction of an aqueous hydride precursor, and the subsequent production of hydrogen gas, prove to be a viable option. A network of beta-cyclodextrin capped gold nanoparticles (BCD-AuNP) was synthesized and subsequently characterized by Powder X-Ray Diffraction (P-XRD), Fourier Transform Infrared (FTIR), Transmission Electron Microscopy (TEM), and Ultraviolet-Visible Spectroscopy (UV-VIS) to confirm the presence of gold nanoparticles as well as their size of approximately 8 nm. The catalytic activity of the nanoparticles was tested in the hydrolysis reaction of sodium borohydride. The gold catalyst performed best at 303 K producing 1.377 mL min−1 mLcat−1 of hydrogen. The activation energy of the catalyst was calculated to be 54.7 kJ/mol. The catalyst resisted degradation in reusability trials, continuing to produce hydrogen gas in up to five trials.

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Influence of Co-Precipitation Agent on the Structure, Texture and Catalytic Activity of Au-CeO2 Catalysts in Low-Temperature Oxidation of Benzyl Alcohol

Catalysts ◽

10.3390/catal11050641 ◽

2021 ◽

Vol 11 (5) ◽

pp. 641

Author(s):

Lukasz Wolski ◽

Grzegorz Nowaczyk ◽

Stefan Jurga ◽

Maria Ziolek

Keyword(s):

Gold Nanoparticles ◽

Catalytic Activity ◽

Low Temperature ◽

Benzyl Alcohol ◽

Low Temperature Oxidation ◽

Temperature Oxidation ◽

Oxidation Of Benzyl Alcohol ◽

Key Factor ◽

Au Particle Size ◽

Co Precipitation

The aim of the study was to establish the influence of a co-precipitation agent (i.e., NaOH–immediate precipitation; hexamethylenetetramine/urea–gradual precipitation and growth of nanostructures) on the properties and catalytic activity of as-synthesized Au-CeO2 nanocomposites. All catalysts were fully characterized with the use of XRD, nitrogen physisorption, ICP-OES, SEM, HR-TEM, UV-vis, XPS, and tested in low-temperature oxidation of benzyl alcohol as a model oxidation reaction. The results obtained in this study indicated that the type of co-precipitation agent has a significant impact on the growth of gold species. Immediate co-precipitation of Au-CeO2 nanostructures with the use of NaOH allowed obtainment of considerably smaller and more homogeneous in size gold nanoparticles than those formed by gradual co-precipitation and growth of Au-CeO2 nanostructures in the presence of hexamethylenetetramine or urea. In the catalytic tests, it was established that the key factor promoting high activity in low-temperature oxidation of benzyl alcohol was size of gold nanoparticles. The highest conversion of the alcohol was observed for the catalyst containing the smallest Au particle size (i.e., Au-CeO2 nanocomposite prepared with the use of NaOH as a co-precipitation agent).

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One-step fabrication of highly dense gold nanoparticles on Polyamide for surface-enhanced Raman scattering

Applied Surface Science ◽

10.1016/j.apsusc.2021.149856 ◽

2021 ◽

pp. 149856

Author(s):

Chunlei Huang ◽

Huanhuan Zhao ◽

Zhixiang Peng ◽

Biao Zheng ◽

Cheng Zhang ◽

...

Keyword(s):

Gold Nanoparticles ◽

Raman Scattering ◽

Surface Enhanced Raman Scattering ◽

Surface Enhanced ◽

Surface Enhanced Raman ◽

One Step ◽

Enhanced Raman Scattering

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Catalytic activity of CuGHK peptide-based porous material

Catalysis Science & Technology ◽

10.1039/d1cy00670c ◽

2021 ◽

Author(s):

Francisco G. Cirujano ◽

Nuria Martin ◽

Neyvis Almora-Barrios ◽

Carlos Martí-Gastaldo

Keyword(s):

Catalytic Activity ◽

Porous Material ◽

Active Sites ◽

Room Temperature ◽

Side Chain ◽

Periodic Distribution ◽

Lysine Side Chain ◽

One Step

Room temperature one-step synthesis of the peptide-based porous material with a periodic distribution of pockets decorated with lysine side chain active sites behaves as a heterogeneous organocatalyst. The pockets are...

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